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https://issues.apache.org/jira/browse/KARAF-3621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14369286#comment-14369286
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Ancoron Luciferis commented on KARAF-3621:
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Of course, preferable would be something like an Ed25519, but this is currently
not supported by MINA/SSHD, so we're left with RSA.
> Generate a more secure host key for SSH by default
> --------------------------------------------------
>
> Key: KARAF-3621
> URL: https://issues.apache.org/jira/browse/KARAF-3621
> Project: Karaf
> Issue Type: Improvement
> Components: karaf-shell
> Affects Versions: 3.0.3
> Reporter: Ancoron Luciferis
> Labels: security
>
> By default, the Karaf SSH server generates a new 1024-bit DSA host key.
> As we've learned from the crypto specialists in the past few years, this is
> no longer seen as being a reasonably secure key pair generation algorithm.
> At the time of this writing, a reasonably secure key pair would be generated
> using RSA with a size of 4096 bits.
> References:
> *
> http://security.stackexchange.com/questions/5096/rsa-vs-dsa-for-ssh-authentication-keys
> * http://meyering.net/nuke-your-DSA-keys/
> * https://stribika.github.io/2015/01/04/secure-secure-shell.html
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